[Feature Request] Store images in another repository

[MoritzWeber0]

Since it's not possible to upload artifacts to comments as attachments via API (https://github.com/reg-viz/reg-actions/issues/154), I was looking for alternative ideas to reduce the size of the repository, but still use report with images.

It would be great to support storing the artifacts in a separate repository. Since authentication can't handled via the auto-generated GITHUB_TOKEN in this case, the user would need to create a fine-grained token for the target repository and add it to the source repository as Actions Secret Variable.

The URL to the "storage" repository could be added as input variable to the action.